The billionaire heiress, 28, wants Sacha Hopkins to back off in the run-up to her wedding to her fella Jay Rutland.

Sacha, 35, and Jay, 31, split four years ago, but he still pays her son’s school fees even though he is not the dad.

The youngster is the nephew of Match Of The Day presenter Gary Lineker, 52, and was born during Sacha’s brief marriage to the footballer’s brother, Wayne, 50.

A source said: “Jay is still involved with the little boy. Since Tamara has been with Jay, Sacha calls up at all times of day and night. Things came to a head last week for Tamara after Sacha vowed she would turn up when she celebrates her big day.

“Tamara feels enough is enough and is going to fight for her man.

“She is not going to let anyone get in the way of her happy day.” Last night Sacha was not available for comment.